y = 2x-3

The 2 in front of the x is the gradient.

That means that if you could travel along the line to
the right, you would always go twice as far north as 
you would go east.  See the graph below.

The -3 on the right end of the equation is the 
y-coordinate of the y-intercept.

So the y-intercept is the point (0,-3)



Edwin